Talking-machine stop



L.'DAVENPORT. TALKING MACHINESTO'P- APPLICATION FILED JULY 18, 1919.

1,376,261 Patented Apr. 26, 1921.

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ATTORNEY.

[5021c L.Daverpor7 NVENTOR.

UNITED STATES PATENT OFFICE.

ISAAC L. DAVENIORT, OF CAMDEN, NEW JERSEY, ASSIGNOR OF ONE-HALF '10 WILLIAM W. ARMSTRONG, OF CAMDEN, NEW JERSEY.

TALKING-MACHINE STOP.

To all whom it may concern Be it known that 1, Isaac L. DAVENPORT, a citizen of the United States, residing at Camden, in the county of Camden and State of New Jersey, have invented new and useful Improvements in Talking-Machine Stops, of which the following is a specification.

The invention relates to talking machines and has for an object to provide a stop for automatically stopping the turn-table and therefore the rotation of the record on the turn-table when the stylus on the tone arm hasreached the end of the record or the selection that is reproducechthrough the medium of the record.

The invention comprehends among other features a talking machine stop which when once set up on a talking machine need not be thereafter adjusted-to each individual rec- 0rd, but will adjust itself to the particular size of the record to the end that when a record has been placed on a machine equipped with my form of stop and the machine is set in operation, the brake on the turn-table will be automatically disengaged therefrom thus permitting of the usual rotation of the turn-table and the consequent traveling of the stylus over the record toward the inner-most groovethereof, the stop or brake being automatically returned into engagement with the turn-table to bring the latter to a standstill when the stylus reaches the end of a selection on the record or the inner groove of the latter.

I am aware that various forms of talking machine stops are in use for the purpose of stopping the rotation of-a turn-table and consequently the record when the end of the selection which is being played is reached, but in these instances it is necessary to effect an intial adjustment of the device each time that a new record is played and therefore a manual adjustment of the stop mechanism proportionate to the size of the record is a necessary operation to bring about the desired result.

With my devicean-initial adjustment is not necessary and the novel arrangement and construction of the mechanism and its operation relative to a record regardless of its size brings about the desired object whether'the record be of the usual 10, 12, or 14" variety.

In the further disclosure of the invention,

Specification of Letters Patent.

Patented Apr. 26, 1 921.

Application filed July 18, 1919. Serial No..311,696.

reference is to be had to the accompanying drawlng, constituting a part of this specification, in which similar characters of reference denote corresponding parts in all the views, and in which,-

Figure 1 is a fragmentary plan view of a talking machine showing my mechanism applied thereto and in operative position,

parts of the turn-table having been broken the larger gear removed, showing the relation of the brake operating arm with the notched holding piece.

Referring more particularly to the views the numeral 10 indicates the usual turn-table of a talking machine 11 and which turntable is adapted to receive a record 12 having the usual sound grooves 13 thereon, a tone arm 14 being mounted to swing horizontally over the turn-table 10 and including a vertical upright portion 15 suitably swiv-i eled on the talking machine 11, the free end of the tone arm carrying a reproducer 16 provided with a stylus 17 Rotation of the turn-table 10 and consequently rotation of the record 12 which is adapted to lie upon the turn-table 10, is brought about through the medium of a vertically disposed shaft 18 which in this instance is provided with a lateral projection 19 adapted to engage with serrations or teeth 20 on a wheel 21 car- 1 ried on a shaft 22 journaled on a plate 23 secured to the platform 24 of the talking machine. The plate 23 may be secured in any desired position to effect the working of the parts thereon and preferably is disposed immediately beneath the turn-table, the said plate when in this position being in an inobservable place. 4

A member 25 which I may term a brake rod is mounted to slide longitudinally on the plate 23 and is held thereon by suitable pins 26 operating in slots 27 of the rod, said rod at one end being bent upwardly to carry a brakeor stop element 28 which when the rod is in one position is adapted to be spaced from the periphery of the turn-table thus permitting the latter to rotate and when the rod is in its other position the element 28 engages the periphery of the turn-table arresting the rotation thereof. The rod is normally held in what might be termed braking position by an expansible helical spring 29 encircling an extension 30 of the rod, one .end of the spring abutting against the rod at 31 and the other end abutting against a lug or hearing 32 struck up or otherwise provided on the plate 23. Now it will be seen by reference to the slot 27 through which the pin 26 extends that the slot 27 is made sufliciently wide so that the rod 25 will not only slide longitudinally on the plate but has a lateral action thereon, the latter although very slight, being sufiicient for the purpose desired. Therefore by the provision of a spring 33, mounted on the plate and bearing against an edge of the rod 25, the said rod will have a lateral pressure di rected against its inner end so that when the rod is moved outwardly disengaging the brake element 28 from the periphery of the turn-table, a notch 34 in the rod and forming a projection 35 will receive a projection 36 of an adjusting element 37 thus holding the rod in its outward position, said adjusting element being in the nature of a flat piece that is pivoted at 38 and adjustable by a pin and slot at 39 so that the end of the adjusting element having the projection 36, can be moved toward or away from the inner end portion of the rod thus providing for an adjustment of the engagement of the rod with the adjusting element as to the lateral play of the rod on the plate.

The shaft 22 carries a pinion 40 which in the brake-applied position is not engaged by a toothed wheel or gear 41 loosely mounted on a stud shaft 42 projecting upwardly from the inner extremity of the rod 25 but when the rod 25 is moved outwardly against the action of the spring 29 to engage the projection 35 against the projection 36 and hold the rod in its outermost position, the teeth of the gear 41 will be brought into mesh with the teeth of the pinion 40 as shown.

In order to actuate the rod 25 to move into the outward position mentioned, I provide a projection 43 on a rack arm 44 which is pivoted at 45. the rod 25 being slotted as at 46 for the pivotal connectionof the rack arm with the plate 23, said rack arm including a crank or off-set portion 47 having pivotal connection with an operating rod 48 which has pin and slot connection at 49 with an arm 50 projecting from the vertical upright portion 15 of the tone arm and clamped securely thereto by a suitable clamp 51. When the tone arm is swung from an inner position to an outer position in order to bring the stylus 17 to the 'first groove along the outer edge of the record,

the relative action of the rod 48 will swing the rack arm 44 thus causing the projection 43 to strike against a projection 52 formed integrally with the rod 25 thereby moving the rod against the action of the spring 29 so as to release the brake element 28 from the periphery of the turn-table and also bring the rod to a point where the action of the spring 33 will cause the projection 36 of the adjusting member to be received in the notch 34 at the inner end of the rod thus also bringing the teeth of the gear 41. into mesh with the pinion 40. It will be seen that the rack arm 44 carries a suitable rack 53 which is pivoted on the extremity of the rack arm and is engaged by a spring 54 having one arm secured to the rack arm and the other arm to the rack, said spring tending to swing the rack 53 outwardly with the outward swinging movement of the rod limited by'a stop or projection 55 on the extremity of the rack arm 44. The stud shaft 42 carries a pinion 56 which is adapted to be engaged by the rack 53 and which in fact constitutes the most essential part of the operation of the device as will be now more fully disclosed.

Now referring for a moment to Fig. 2, we

will assume that the turn-table is in a sta tionary position being held against rotation by the brake element 28 bearing against the periphery of the turn-table. Now when a new record has been placed upon the turntable the tone arm 14 is swung outwardly to bring the stylus 17 to the periphery of the record or immediately adjacent thereto in order that the stylus can be engaged with the first groove of the record, and because of the swinging of the tone arm it will be seen that the rod 25 will be actuated as mentioned heretofore, to be moved to its outward position against the tension of the spring 29. This outward movement of the rod releases the brake element 28 from engagement with the periphery of the turn-table and at the same time it brings the teeth of the gear 41 into engagement with the teeth of the pinion 40 and also secures the rod 25 from returning to its initial position by reason of the engagement of the projection 36 in the notch 34. Now at the moment the brake element 28' is removed from engagement with the periphery of the turn-table the motor of the talking machine ,(not shown) brings about rotation of the vertical shaft or spindle 18 thus rotating the wheel 21, which in turn imparts rotation to the pinion 40, the latter therefore bringing about rotation of the gear 41 and which in turn will rotate the it will of course be clear that the stylus 17 the teeth of the rack 58 and thus the rack will be advanced over the pinion 56 proportionately as the tone arm swings inwardly.

Inasmuch as the gear 41 is moving in a clockwlse dlrection, the rack wlll contlnue to feed in from its free end toward the point of its pivotal connection with the arm 44. Now when the stylus 17 reaches the innermost groove of the record and which will of course occur about the time the selection on the record is finished or shortly thereafter, the swinging movement of the tone arm will cease and thus movement of the arm 44 will be brought to a stop. The continued rotation of the gear 11 however and the pinion 56 carried thereby, will now tend to exert a push against the rack 53 which is now stationary causing the pinion 56 to ride over the rack a distance equivalent to the lateral movement of the rod 25, thus moving the rod 25 away from the projection 36 of the adjusting member or element 37. At the moment the rod 25 is moved sufficiently away from the projection 36 to free the rod, the action of the sprin 29 will cause the rod 25 to move longitudmally back to its initial position, thus bringing the brake or stop element 28 into reengagement with the periphery of the turn-table, bringing the latter to a standstill.

With this device it will be seen that various sizes of records, arranged in playing position will be brought to a stop at the end of the selection or shortly thereafter and that the stop mechanism does not have to be adjusted to each particular record at the time it is placed upon the machine; further that the mere swinging of the tone arm after the record has been placed on the table brings about the operation of the stop mechanism, advancing the various parts into operative position, which parts will later be returned into inoperative or stationary position when the stylus reaches the inner groove of the record and the turn-table is brought to a stationary position by the action of the brake element against its periphery.

It will be understood that various slight changes may be made from the construction set forth, for the purpose of fitting the device to different constructions of talking machines without departing from the spirit of the invention the scope of which is defined in the appended claims.

Having described my invention,I claim,-

1. A stop for a talking machine including a turn-table, comprising a rotatable shaft, a pinion rotatable thereby, a brake rod mounted to slide and to swing, a gear on the rod and normally out of mesh with said pinion, a brake element on said .rod and adapted in brake-applied position to engage the turn-table, an operating rod, a pivoted crank arm, a rack on the crank arm and a pinion on the brake rod and adapted tobe brought into contact with the rack when said brake arm is actuated to move the gear thereon into mesh with the firstmentioned pinion.

2. A stop for a talking machine including a turn-table comprising a rotatable shaft, a pinion rotatable thereby, a brake rod mountcd to slide and to swing, a gear on the rod normally out of mesh with said pinion, a. brake element on said rod and adapted in brake-applied position to engage the turntable, an operating rod, a pivoted crank arm, a rack on the crank arm and a second pinion on the gear carried by the brake and adapted to be brought into contact with the rack when said brake rod is actuated to move said gear into mesh with said first mentioned pinion, the movement of said brake rod releasing said brake from contact with the turn-table.

3. A stop for a talking machine including a turn-table comprising a rotatable shaft, a pinion rotatable thereby, a brake rod mounted to slide and to swing, a gear on the rod and normally out of mesh with said pinion, a brake element on said rod and adapted to normally engage the turn-table, an operating rod, a pivoted crank arm connecting with said rod, a rack on the crank arm, a second pinion on the gear carried by the brake rod and means on the crank arm and engaging the brake arm when the crank rod is actuated to actuate said brake rod and move said brake out of contact with said turn-table and simultaneously bring said second pinion into contact with the rack and move said gear into mesh with said first mentioned pinion.

4. A stop for a talking machine including a turn-table comprising a rotatable shaft, a pinion thereon, a brake rod mounted to slide and to swing, a gear on the rod and normally out of mesh with said pinion, a brake element on said rod and adapted to normally engage the turn-table, an operating rod, a pivoted crank arm connecting with said rod, a rack on the crank arm, a second pinion on the gear carried by the brake rod, means on the crank arm and engaging the brake rod when the crank arm is actuated to actuate said brake rod and move said brake out of contact with said turn-table and simultaneously bring said second pinion into contact with the rack and move said gear into mesh with said first mentioned pinion, and an adjustable holding element adapted to be engaged by said brake rod when the latter is actuated to releasably hold the brake rod into the position the latter is moved, by the means actuating the brake rod.

5. The combination in a talking machine, of a motor driven turn table, movable spring-actuated brake means complementary thereto, a movable tone arm, means rotatable in concert with the turn table, rotatable means carried by the movable brake means, means operable by the tone arm to move the brake means to unapplied position and to engage the second named rotatable means with the first-named rotatable means, 10

on the brake means through the medium of 15 the first-named rotatable means. 7

In testimony whereof I afiix my signature.

ISAAC L. DAVENPORT. 

